XPS 7590 - ubuntu usb not recognized in bios

Hi,

I just received a dell xps 15 7590 and tried to install ubuntu on dual boot with windows. It’s my first time installing ubuntu. I created my usb drive with ubuntu on GPT and UEFI and i changed from RAID on to AHCI. My problem is that I can’t find the option to boot from the usb drive on the boot menu. Also, there is no option to change to legacy in my bios.

Any suggestions ?

Thanks.